Security readout for executives and security teams
Plain-English summary
This vulnerability can expose sensitive files from the web root of affected Schneider Electric Modicon controllers and communication modules. An unauthenticated network attacker can trigger the leak by sending an HTTP request to the device web server. The direct business risk is disclosure of operational or configuration information from industrial control assets.
Executive priority
Treat as high priority for OT environments. It is not reported as actively exploited in the supplied evidence, but unauthenticated network disclosure from industrial devices can aid follow-on attacks and should be addressed through inventory, vendor guidance, and access control.
Technical view
CVE-2021-22785 is CWE-200 information exposure affecting multiple Modicon M340, Premium, and Quantum CPUs or Ethernet modules. CVSS 3.1 is 7.5: network reachable, low complexity, no privileges, no user interaction, high confidentiality impact, and no integrity or availability impact stated.
Likely exposure
Exposure is most likely where affected Modicon device web servers are reachable from enterprise networks, vendor remote-access paths, or the internet. Assets isolated on tightly controlled OT networks have lower likelihood, but still require inventory validation.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The vulnerability is still serious because exploitation is unauthenticated over the network and targets industrial control devices, but available evidence only supports information disclosure, not code execution or service disruption.
Researcher notes
Do not assume every listed all-version product has a firmware fix from the CVE text alone. Validate exact model, firmware, and web-server exposure. The sources support confidentiality impact only; integrity, availability, exploitation in the wild, and weaponized exploit availability are not established here.
Mitigation direction
- Identify affected Modicon M340, Premium, and Quantum assets in OT inventory.
- For BMXP34 CPUs, plan upgrade to V3.40 or later where operationally approved.
- For all-version affected products, check Schneider advisory SEVD-2021-257-02 for vendor guidance.
- Limit HTTP access to device web servers to trusted management networks.
- Prioritize compensating controls where firmware remediation is unavailable or operationally delayed.
Validation and detection
- Compare device model and firmware against the affected product list.
- Confirm whether device web servers are reachable from non-management networks.
- Check whether BMXP34 CPUs are below V3.40.
- Document all all-version affected modules for vendor-guidance tracking.
- Verify remediation or access controls after approved maintenance windows.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-22785 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02CVE reference, schneider · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.